blues and twos
An emergency vehicle, such as an ambulance or police car, that has blue flashing lights and a siren that sounds two notes. Primarily heard in UK. Pull the car over and let the blues and twos pass. The police car whizzed by us, blues and twos going, and pulled over at the scene of the accident. When you're the patient, riding in an ambulance with the blues and twos is not exactly exciting.
Farlex Dictionary of Idioms. © 2024 Farlex, Inc, all rights reserved.